Power supply converter with synchronous rectifier and control method for synchronous rectifier

A power converter and synchronous rectifier technology, which is applied in high-efficiency power electronic conversion, output power conversion device, conversion of DC power input to DC power output, etc. Problems such as inability to precisely control synchronous rectifiers

Inactive Publication Date: 2011-03-30
DELTA ELECTRONICS INC
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The main purpose of the present invention is to provide a power converter with a synchronous rectifier and a control method for the synchronous rectifier, to solve the problem that the known power converter directly uses the control integrated circuit to control the operation of the synchronous rectifier, so the control inte

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  • Power supply converter with synchronous rectifier and control method for synchronous rectifier
  • Power supply converter with synchronous rectifier and control method for synchronous rectifier
  • Power supply converter with synchronous rectifier and control method for synchronous rectifier

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Embodiment Construction

[0077] Some typical embodiments embodying the features and advantages of the present invention will be described in detail in the description in the following paragraphs. It should be understood that the present invention is capable of various changes in different ways without departing from the scope of the present invention, and that the description and drawings therein are illustrative in nature rather than limiting the present invention.

[0078] see figure 1 , which is a schematic circuit block diagram of a power converter according to a preferred embodiment of the present invention. Such as figure 1 As shown, the power converter 1 of this embodiment is connected to a load L o , which is used to convert an input voltage V in converted to an output voltage V o , to supply the load L o use. The power converter 1 includes a switching circuit 11, a transformer T, a main control circuit 12, a resonant circuit 15, a filter circuit 16, at least one synchronous rectificatio...

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Abstract

The invention discloses a power supply converter with a synchronous rectifier and a control method for the synchronous rectifier. The power supply converter comprises a switching circuit, a transformer, a main control circuit, the synchronous rectifier, a current transformer and a synchronous rectifying control circuit, wherein the transformer is provided with a primary winding and a secondary winding, and the primary winding is connected with the switching circuit; the main control circuit is connected with the switching circuit to control the operation of the switching circuit; the synchronous rectifier is connected in series with the secondary winding; the current transformer is connected in series with the synchronous rectifier and outputs a detection signal according to the current flowing through the synchronous rectifier; the synchronous rectifying control circuit is connected with the control end of the synchronous rectifier, the current transformer and the control end of the switching circuit to receive the detection signal and a main control signal and used for controlling the operation of the synchronous rectifier; and when the main control circuit controls the switching circuit to be conducted, the synchronous rectifying control circuit controls the synchronous rectifier to be conducted, and the synchronous rectifying control circuit controls stoppage of the synchronous rectifier according to the detection signal. The synchronous rectifier is not easily burnt, and the integral efficiency is relatively promoted.

Description

technical field [0001] The invention relates to a power converter, in particular to a power converter with a synchronous rectifier which uses a current transformer to detect the cut-off time of the synchronous rectifier and a control method for the synchronous rectifier. Background technique [0002] In various power converter circuits, such as resonant power converters, there are usually switching circuits, transformers and rectifier diodes. Wherein the switching circuit is connected with the primary winding of the transformer, and is controlled by a control circuit to be turned on or off. The transformer receives electric energy through the primary winding, and transmits the electric energy of the primary winding to the secondary winding of the transformer by electromagnetic induction when the switching circuit is switched on or off. As for the rectifier diode, it is connected with the secondary winding of the transformer, and is used for rectifying the AC voltage induced...

Claims

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Application Information

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IPC IPC(8): H02M3/24H02M3/335
CPCY02B70/1475Y02B70/10
Inventor 李晗刘钢陈警章进法
Owner DELTA ELECTRONICS INC
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